Proper temp for fans to turn on
Thread Starter
Audiworld Junior Member
Joined: Nov 2008
Posts: 23
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Proper temp for fans to turn on
Hi,
I recently replaced the radiator fan thermoswitch on my 95 90 quattro.
The old switch would kick the fan on when the temp gauge got to the third line. This seemed low to me but since I don't know the graduations of the gauge I just let it go.
Long story short, the switch went bad and I replaced it with a new one. Now the fan activates on the fifth line (the first thick line). Is this right?
I'm assuming that the two thicker lines on the temp gauge represent where the fan should kick on low/high speed.
The picture should help explain things better
I recently replaced the radiator fan thermoswitch on my 95 90 quattro.
The old switch would kick the fan on when the temp gauge got to the third line. This seemed low to me but since I don't know the graduations of the gauge I just let it go.
Long story short, the switch went bad and I replaced it with a new one. Now the fan activates on the fifth line (the first thick line). Is this right?
I'm assuming that the two thicker lines on the temp gauge represent where the fan should kick on low/high speed.
The picture should help explain things better
Audiworld Junior Member
Joined: Feb 2003
Posts: 45
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Radiator fan
My fan kicks in at the fifth line too. I have a 95 cab.
Cheers!
QUOTE=2LSS;24201713]Hi,
I recently replaced the radiator fan thermoswitch on my 95 90 quattro.
The old switch would kick the fan on when the temp gauge got to the third line. This seemed low to me but since I don't know the graduations of the gauge I just let it go.
Long story short, the switch went bad and I replaced it with a new one. Now the fan activates on the fifth line (the first thick line). Is this right?
I'm assuming that the two thicker lines on the temp gauge represent where the fan should kick on low/high speed.
The picture should help explain things better[/QUOTE]
Cheers!
QUOTE=2LSS;24201713]Hi,
I recently replaced the radiator fan thermoswitch on my 95 90 quattro.
The old switch would kick the fan on when the temp gauge got to the third line. This seemed low to me but since I don't know the graduations of the gauge I just let it go.
Long story short, the switch went bad and I replaced it with a new one. Now the fan activates on the fifth line (the first thick line). Is this right?
I'm assuming that the two thicker lines on the temp gauge represent where the fan should kick on low/high speed.
The picture should help explain things better[/QUOTE]
Banned
Joined: Jan 2002
Posts: 4,631
Likes: 8
From: Central Idaho
The solid line at 11 o'clock is normal operating temperature, if your fan was kicking on before and your not running A/C the engine was probably never getting to it's desired temp.
In fact the fan should not kick on at normal temp either as the coolant is keeping it where it needs to be, only when the needle goes further right to the point the coolant cannot handle the heat should the fan kick on to help.
It's possible your 3 pin coolant temp switch which runs the dash gauge is not giving it an accurate reading.
In fact the fan should not kick on at normal temp either as the coolant is keeping it where it needs to be, only when the needle goes further right to the point the coolant cannot handle the heat should the fan kick on to help.
It's possible your 3 pin coolant temp switch which runs the dash gauge is not giving it an accurate reading.
Thread Starter
Audiworld Junior Member
Joined: Nov 2008
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Well, the picture is slightly misleading.
I believe that when I took it, the fans had just turned off. I did notice the the needle go slightly above the solid line when the fans kicked on. Initially I was afraid of the car overheating, but I can see now that is not the case.
I believe that when I took it, the fans had just turned off. I did notice the the needle go slightly above the solid line when the fans kicked on. Initially I was afraid of the car overheating, but I can see now that is not the case.
Thread Starter
Audiworld Junior Member
Joined: Nov 2008
Posts: 23
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After driving around in the cooler weather, I'm thinking my thermostat may be stuck open.
The only time that the engine temperature gets high enough to start the fans is when the car sits idling for awhile. While driving, the needle doesn't get to the fourth mark on the gauge.
On the plus side, it runs slightly warmer than with the old thermoswitch. I originally thought the thermostat was the problem but when I noticed the fans kicking on at the low temp I began to suspect the switch.
The only time that the engine temperature gets high enough to start the fans is when the car sits idling for awhile. While driving, the needle doesn't get to the fourth mark on the gauge.
On the plus side, it runs slightly warmer than with the old thermoswitch. I originally thought the thermostat was the problem but when I noticed the fans kicking on at the low temp I began to suspect the switch.
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